Income Taxes - Schedule of Provision for (Benefit from) Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current income tax provision (benefit)
Federal	$ (99)	$ (66)	$ (72)
State	1,113	1,525	442
Foreign	7	12	23
Total current income tax provision	1,021	1,471	393
Deferred income tax provision (benefit):
Federal	13,019	(74,312)	5,169
State	3,875	(12,165)	3,768
Total deferred income tax provision (benefit)	16,894	(86,477)	8,937
Total income tax provision (benefit)	$ 17,915	$ (85,006)	$ 9,330